Audio amplifier



FIG. 1 is an isometric view of the audio amplifier of the present invention;

FIG. 2 is a front view thereof;

FIG. 3 is a left-side view thereof;

FIG. 4 is a right-side view thereof; and,

FIG. 5 is a top plan view thereof.

Differently stippled areas on the front face and the knob fronts indicate different pastel color surfaces, and while shown intermittently is understood to be extended uniformly across the entire surface upon which it is applied. 

CLAIM The ornamental design for an audio amplifier, as shown and described. 